PHOTOPRODUCTION OF PI0 ON PROTONS BY POLARIZED GAMMA RAYS

The asymmetry (k,θ*)=(dσ-dσ)(dσ+σ) of the polarized cross sections for π0 photoproduction has been measured at θ*=90°for energies k of the incident photon in the range 230-380 MeV. The experiment has been performed with the polarized γ-ray beam of the Frascati 1-GeV electron synchrotron. The experimental results are compared with the present theoretical predictions in order to investigate the importance of ω exchange in the t channel and the contribution of the E1+(3) multipole at the 33 resonance. The theory with ω exchange is in the best agreement with the experiment. © 1969 The American Physical Society.